body {
    background-color: #000;
}

h1,p {
    margin: 0;
    padding: 0;
}

/*页面宽度定义、居中*/
.wrapper {
    width: 1006px;
    background-color: #fff211;
    margin: 0 auto; /*针对父容器居中*/
}

.clear{
    clear: both;
}

.header {
    width: 991px;
    background-color: white;
    margin: 0 auto;
    min-height: 200px;
}

.main {
    width: 991px;
    background-color: green;
    margin: 0 auto;
}

.footer {
    width: 991px;
    background-color: blue;
    margin: 0 auto;
    min-height: 80px;
}

.main .sidebar{
    float: left;
    width: 244px;
    margin-right: 5px;
    background-color: blueviolet;
    min-height: 600px;
}

.main .content{
    float: left;
    width: 742px;
    background-color: chartreuse;
    min-height: 600px;
}
